hm, maybe that's why...TkDVD is a GUI to dvd+rw-tools and cdrecord. It's dvd+rw-tools (Not included in DSL base) that allows burning DVDs.
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Now that my DVD drive has gone flakey I can't verify.
I had a "dead" cd-writer which I "fixed" by taking out the cables (both ends) and reseating them a few times. Maybe this could fix your drive as well.
original here.